带接缝圆形地下连续墙室内模型试验研究OACSTPCD

In order to investigate the internal forces and deformation characteristics of the circular diaphragm wall during the excavation of a circular foundation pit,indoor model testes are carried out considering various factors such as joints,wall diameter and lining,and a three-dimensional numerical model is created using ABAQUS to simulate and analyze the stress characteristics of the circular diaphragm wall during the step excavation of foundation pit.The results show that,(a)the circular diaphragm wall still exhibits the"Space arch effect"even when there are joints,and the circumferential compressive stress is significantly higher than the vertical stress;(b)the lateral displacement of the wall is small and the settlement of the soil behind the wall is also minimal,and the changes in circumferential stress and circumferential displacement follow a similar pattern with a larger distribution form in the middle and a smaller distribution at the two ends;and(c)the diameter of the wall has the greatest influence on the arch effect of the ground diaphragm wall,followed by the number of joints,while the inner lining has the least influence.